Object Oriented Programming in Best C# interview Questions and Answers

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Thursday, October 1, 2015

Stacks refer to a list in which all items are accessed and processed on the Last-In-First-Out (LIFO) basis. In a stack, elements are inserted (push operation) and deleted (pop operation) from the same end called top.
Queues refer to a list in which insertion and deletion of an item is done on the First-In-First-Out (FIFO) basis. The items in a queue are inserted from the one end, called the rear end, and are deleted from the other end, called thefront end of the queue.

52. Define an event.

Whenever an action takes place in a class, that class provides a notification to other classes or objects that are assigned to perform particular tasks. These notifications are called events. For example, when a button is clicked, the class generates an event called Click. An event can be declared with the help of the event keyword.

53. What are structures?

Structure is a heterogeneous collection of elements referenced by the same name. A structure is declared using the struct keyword. The following is an example that creates a structure to store an employee's information:

The preceding example defines a structure emp and the members of this structure specify the information of an employee.

54. When do you really need to create an abstract class?

We define abstract classes when we define a template that needs to be followed by all the derived classes.

Yes, customized exceptions can be defined in code by deriving from the System.Exception class.

42. Is it possible to execute two catch blocks?

You are allowed to include more than one catch block in your program; however, it is not possible to execute them in one go. Whenever, an exception occurs in your program, the correct catch block is executed and the control goes to the finally block.

43. What do you mean by data encapsulation?

Data encapsulation is a concept of binding data and code in single unit called object and hiding all the implementation details of a class from the user. It prevents unauthorized access of data and restricts the user to use the necessary data only.

44. What is the difference between procedural and object-oriented programming?

Procedural programming is based upon the modular approach in which the larger programs are broken into method. Each procedure is a set of instructions that are executed one after another. On the other hand, OOP is based upon objects. An object consists of various elements, such as methods and variables.
Access modifiers are not used in procedural programming, which explains that the entire data can be accessed freely anywhere in the program. In OOP, you can specify the scope of a particular data by using access modifiers - public,private, internal, protected, and protected internal.

45. Explain the concept of destructor?

A destructor is a special method for a class and is invoked automatically when an object is finally destroyed. The name of the destructor is also same as that of the class but is followed by a prefix tilde (~).

A destructor is used to free the dynamic allocated memory and release the resources. You can, however, implement a custom method that allows you to control object destruction by calling the destructor.

The main features of a destructor are as follows:

• Destructors do not have any return type
• Similar to constructors, destructors are also always public
• Destructors cannot be overloaded.

46. Can you declare a private class in a namespace?

The classes in a namespace are internal, by default. However, you can apparently declare them as public only and not as private, protected, or protected internal. The nested classes can be declared as private,protected, or protected internal.

47. A structure in C# can implement one or more interfaces. Is it true or false?

Yes, it is true. Like classes, in C#, structures can appliance one or more interfaces.

48. What is a static constructor?

Static constructors are introduced with C# to initialize the static data of a class. CLR calls the static constructor before the first instance is created.

The static constructor has the following features:
• No access specifier is required to define it.
• You cannot pass parameters in static constructor.
• A class can have only one static constructor.
• It can access only static members of the class.
• It is invoked only once, when the program execution begins

49. What are the different ways a method can be overloaded?

The different ways to overload a method are given as follows:

• By changing the number of parameters used
• By changing the order of parameters
• By using different data types for the parameters

50. Differentiate between an abstract class and an interface.

Abstract Class:

1. A class can amplify only one abstract class
2. The members of abstract class can be private as well as protected.
3. Abstract classes should have subclasses.
4. Any class can extend an abstract class.
5. Methods in abstract class can be abstract as well as concrete.
6. There can be a constructor for abstract class.
7. The class extending the abstract class may or may not implement any of its method.
8. An abstract class can implement methods.

Interface

1. A class can appliance several interfaces
2. An interface can only have public members.
3. Interfaces must have implementations by classes
4. Only an interface can extend another interface.
5. All methods in an interface should be abstract
6. Interface does not have constructor.
7. All methods of interface need to be implemented by a class implementing that interface.
8. Interfaces cannot contain body of any of its method.

Wednesday, September 30, 2015

What are the distinct characteristics of an abstract class?
An abstract class is a class that cannot be instantiated and is always used as a base class.
The following are the characteristics of an abstract class:

• You cannot instantiate an abstract class directly. This implies that you cannot create an object of the abstract class; it must be inherited.
• You can have abstract as well as non-abstract members in an abstract class.
• You must declare at least one abstract method in the abstract class.
• An abstract class is always public.
• An abstract class is declared using the abstract keyword.

The basic objective of an abstract class is to provide a common definition of the base class that multiple derived classes can share

37. Give a brief description of properties in C# and the advantages that are obtained by using them in programs.

In C#, a property is a way to reveal an internal data element of a class in a simple and intuitive manner. In other words, it is a simple extension of data fields. You can create a property by defining an externally available name and then writing the set and get property accessors. The get property accessor is used to return the property value. The set property accessor is used to assign a new value to the property.

All .NET languages supports single, hierarchical, and multilevel inheritance. They do not support multiple inheritance because in these languages, a derived class cannot have more than one base class. However, you can implement multiple inheritance in.NET through interfaces.

39. You have defined a destructor in a class that you have developed by using the C# programming language, but the destructor never executed. Why did the destructor not execute?

The runtime environment automatically invokes the extirpator of a class to release the resources that are place by variables and methods of an object. However, in C#, programmers cannot control the timing for invoking destructors, as Garbage Collector is only responsible for releasing the resources used by an object. Garbage Collector automatically gets information about unreferenced objects from .NET's runtime environment and then invokes the Finalize() method.

Although, it is not preferable to force Garbage Collector to perform garbage collection and retrieve all inaccessible memory, programmers can use the Collect() method of the Garbage Collector class to forcefully execute Garbage Collector.

40. What is a hashtable?

Hashtable is a data structure that accomplishes the IDictionary interface. It is used to store multiple items and each of these items is associated with a unique string key. Each item can be accessed using the key attached with it. In short, hashtable is an object holding the key-value pairs.

Methods are the building blocks of a class, in which they are associated together to share and process data to generate the result. In other words, a method is a block of code that contains a series of assertions and illustrates the behavior of a class. While declaring a method you need to specify the access specifier, the return value, the name of the method, and the method parameters. All these associated together is called the signature of the method.

32. What is a namespace?

Namespace is deliberated as a container that contains functionally related group of classes and other types.

33. Do events have return type?

No, events do not have return type.

34. What is the function of the Try-Catch-Finally block?

The try block encompasses those statements that can cause exception and the catch block handles the exception, if it occurs. Catch block contains the statements that have to be executed, when an exception occurs. The finally block always executes, irrespective of the fact whether or not an exception has occurred. The finally block is generally used to perform the cleanup process. If any exception occurs in the try block, the program control directly transfers to its corresponding catch block and later to the finally block. If no exception occurs inside the try block, then the program control transfers directly to the finally block.

35. How can you prevent a class from overriding in C# and Visual Basic?

You can restrain a class from overriding in C# by using the sealed keyword; whereas, the NotInheritablekeyword is used to prevent a class from overriding in Visual Basic.

A delegate is same as to a class which is used for storing the reference to a method and invocating that method at runtime , as required. A delegate can hold the reference of only those methods whose signatures are same as that of the delegate. Some of the examples of delegates are type-safe functions, pointers, or callbacks.

27. What is the syntax to inherit from a class in C#?

When a class is derived from another class, then the members of the base class become the members of the derived class. The access modifier used while accessing members of the base class secludes the access status of the base class members inside the derived class.

The syntax to inherit a class from another class in C# is as follows:
class MyNewClass : MyBaseclass

28. State the features of an interface.

An interface is a generic model that contains only the signature of methods. The signature of a method consists of the numbers of parameters, the type of parameter (value, reference, or output), and the order of parameters. An interface has no accomplishment on its own because it contains only the definition of methods without any method body. An interface is defined using the interface keyword. Moreover, you cannot instantiate an interface. The various features of an interface are as follows:

• An interface is used to appliance multiple inheritance in code. This feature of an interface is quite different from that of abstract classes because a class cannot obtain the features of more than one class but can easily implement multiple interfaces.

• It defines a specific set of methods and their arguments.

• Variables in interface must be declared as public, static, and final while methods must be public and abstract.

• A class implementing an interface must implement all of its methods.
• An interface can derive from more than one interface.

29. Can you use the 'throws' clause to raise an exception?

No, the throws clause cannot be used to raise an exception. The throw statement signals the instance of an exception during the execution of a program. When the program encounters a throw statement, the method terminates and returns the error to the calling method.

30. Define an array.

An array is considered as a homogeneous collection of elements, stored at contiguous memory locations, which can be referred by the same variable name. All the elements of an array variable can be accessed by index values. An Index value specifies the position of a particular element in an array variable.

Yes, you must handle exceptions in code so that you can deal with any unexpected conditions that occur when a program is running. For example, dividing a number by zero or passing a string value to a variable that holds an integer value would result in an exception.

22. Explain the concept of constructor?

Constructor is an unique process of a class, which is called automatically when the sing of a class is created. It is created with the same name as the class and initializes all class members, whenever you access the class.

The main features of a constructor are as follows:

• Constructors do not have any return type.
• Constructors can be overloaded.
• It is not mandatory to declare a constructor; it is invoked automatically by .NET Framework.

23. Can you inherit private members of a class?

No, you cannot inherit private members of a class because private members are accessible only to that class and not outside that class.

24. Does .NET support multiple inheritance?

.NET does not support multiple inheritance directly because in .NET, a class cannot inherit from more than one class. .NET supports multiple inheritance through interfaces

25. How has exception handling changed in .NET Framework 4.0?

In .NET 4.0, a new namespace, System.Runtime.ExceptionServices, has been inagvrated which contains the following classes for handling exceptions in a better and advanced manner:

• HandleProcessCorruptedStateExceptionsAttribute Class - Enables managed code to handle the corrupted state exceptions that occur in an operating system. These exceptions cannot be caught by specifying the try...catch block. To handle such exceptions, you can apply this attribute to the method that is assigned to handle these exceptions.

• FirstChanceExceptionEventArgs Class - Generates an event whenever a managed exception first occurs in your code, before the common language runtime begins searching for event handlers.

Tuesday, September 29, 2015

16. Can you declare an overridden method to be static if the original method is not static?

No. Two virtual methods must have the same signature.

17. Why is the virtual keyword used in code?

The virtual keyword is used while defining a class to specify that the methods and the properties of that class can be overridden in derived classes.

18. Can you allow a class to be inherited, but prevent a method from being overridden in C#?

Yes. Just declare the class public and make the method sealed .

19. Define enumeration?

Enumeration is considered as a value type that contains of a set of named values. These values are constants and are called enumerators. An enumeration type is declared which uses the enum keyword. Each enumerator in an enumeration is associated with an underlying type that is set, by default, on the enumerator. The following is an example that creates an enumeration to store different varieties of fruits:

enum Fruits {Mango, Apple, orange, Guava};

In the preceding example, an enumeration Fruits is created, where number 0 is associated with Mango, number 1with Apple, number 2 with Orange, and number 3 with Guava. You can access the enumerators of an enumeration by these values.